Acoustic bus passenger counter
US3997866A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1975 |
| Grant date | Dec 14, 1976 |
| Priority date | — |
| Expiry date | Mar 31, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S367/90
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for detecting and counting entry and exit of passengers. Transmitted high frequency sound beams define at least two zones through which passengers pass in sequence when entering or leaving a vehicle; the motion of a passenger through the zones produces signals at a receiver which are fed to logic circuits to produce appropriate counts. The logic circuits discriminate between moving human targets and other moving objects within the zones, and include range discrimination to prevent interference from outside the detection area. In one embodiment the sensor is located above the entry area to detect passengers' heads, while another embodiment is located at a level to detect passenger foot motion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.